CN217131244U - Vacuum deoxidization system for boiler water supply - Google Patents
Vacuum deoxidization system for boiler water supply Download PDFInfo
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- CN217131244U CN217131244U CN202220912183.4U CN202220912183U CN217131244U CN 217131244 U CN217131244 U CN 217131244U CN 202220912183 U CN202220912183 U CN 202220912183U CN 217131244 U CN217131244 U CN 217131244U
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Abstract
The utility model provides a vacuum deoxidizing system for boiler feed water, which comprises a deaerator, a water ring vacuum pump and a steam-water separator; a heating steam inlet at the top of the deaerator is communicated with a heating steam system through a steam pipeline, a softened water inlet at the top of the deaerator is communicated with a softened water system through a water inlet pipeline, an exhaust pipe is installed at an exhaust port at the top of the deaerator, and a first outlet at the bottom of the deaerator is communicated with a boiler water feed pump through a pipeline; an air suction port of the water ring vacuum pump is communicated with an air outlet at the top of the deaerator through a first pipeline, an air exhaust port of the water ring vacuum pump is communicated with an air inlet of the steam-water separator through a second pipeline, and an inlet pipeline is communicated with a water inlet of the water ring vacuum pump through a water inlet pipe of the water ring vacuum pump; and the gas outlet of the steam-water separator is communicated with the exhaust pipe through a third pipeline. Compared with the prior art, the utility model provides a boiler feed water vacuum deoxidization system can effectual guarantee deoxidization effect to can be better avoid the water pump to damage.
Description
Technical Field
The utility model relates to a boiler supplies water deoxidization technical field, especially relates to a boiler feedwater vacuum deoxidization system.
Background
In the process of boiler feed water treatment, oxygen removal is a very critical link. Most factory enterprises adopt a thermal deoxygenation method to treat boiler feed water at present, and the method needs to consume a large amount of steam to heat softened water to 104 ℃, so that the oxygen content of the softened water is reduced to 0.05-0.1mg/L specified in national low-pressure boiler water quality standard, and the safe operation of the boiler is guaranteed.
The oxygen removing method adopting thermal oxygen removal has the advantages of simple structure, strong adaptability and good oxygen removing effect, is a commonly used oxygen removing technology and is widely used. In northwest areas, the practical application of the method has a plurality of problems, firstly, when the temperature of the deoxygenated water is lower than 104 ℃, the deoxygenation effect is poor, and when the temperature of the deoxygenated water is higher than 104 ℃, the feed water of the boiler is easily vaporized, so that the dry grinding damage of the feed pump of the boiler is caused.
SUMMERY OF THE UTILITY MODEL
The method aims at the technical problems that the boiler feed water is treated by a thermal deoxidization method in the prior art, the deoxidization effect is poor, and a water pump is easily damaged. The utility model provides a deoxidization effect is better to can better avoid the boiler feed water vacuum deoxidization system of water pump damage.
A vacuum deoxidation system for boiler feed water comprises a deaerator, a water ring vacuum pump and a steam-water separator;
a softened water inlet at the top of the deaerator is communicated with a softened water system through a water inlet pipeline, an exhaust pipe is installed at an exhaust port at the top of the deaerator, and a first outlet at the bottom of the deaerator is communicated with a boiler feed pump through a pipeline;
an air suction port of the water ring vacuum pump is communicated with an air outlet at the top of the deaerator through a first pipeline, an air exhaust port of the water ring vacuum pump is communicated with an air inlet of the steam-water separator through a second pipeline, and an water inlet pipeline is communicated with a water inlet of the water ring vacuum pump through a water inlet pipe of the water ring vacuum pump;
and the gas outlet of the steam-water separator is communicated with the exhaust pipe through a third pipeline.
Preferably, the first pipeline, the second pipeline and the third pipeline are all provided with stop valves.
Preferably, a check valve is further disposed on the first pipeline.
Preferably, the bottom of the water ring vacuum pump is provided with a damping seat, and a silencing partition part is arranged between the damping seat and the water ring vacuum pump.
Preferably, the steam-water separator is a baffle type steam-water separator.
Preferably, still include the PLC controller, still be provided with first temperature sensor in the oxygen-eliminating device, first temperature sensor with the input of PLC controller is connected, the output of PLC controller with water ring vacuum pump connection, the PLC controller is used for the basis first temperature sensor's detection signal control the operation of water ring vacuum pump.
Preferably, a vacuum degree sensor is further arranged in the deaerator and connected with the input end of the PLC.
Preferably, the heating steam inlet at the top of the deaerator is communicated with a heating steam system through a steam pipeline, a first steam electric valve is arranged on the steam pipeline, the steam pipeline is communicated with the water inlet pipeline through a heat exchange pipeline, and a heat exchanger is arranged on the heat exchange pipeline.
Preferably, a second temperature sensor is further arranged in the water inlet pipeline, a second steam electric valve is further arranged in the heat exchange pipeline, the second temperature sensor is connected with the input end of the PLC, the second steam electric valve is connected with the output end of the PLC, and the PLC is further used for controlling the second steam electric valve to operate according to a detection signal of the second temperature sensor.
Preferably, the water inlet pipe of the water ring vacuum pump is provided with an electromagnetic valve, a ball valve and a filter.
Compared with the prior art, the boiler water supply vacuum deoxygenation system provided by the utility model comprises a deoxygenator, a water ring vacuum pump and a steam-water separator; a softened water inlet at the top of the deaerator is communicated with a softened water system through a water inlet pipeline, an exhaust pipe is installed at an exhaust port at the top of the deaerator, and a first outlet at the bottom of the deaerator is communicated with a boiler feed pump through a pipeline; an air suction port of the water ring vacuum pump is communicated with an air outlet at the top of the deaerator through a first pipeline, an air exhaust port of the water ring vacuum pump is communicated with an air inlet of the steam-water separator through a second pipeline, and an water inlet pipeline is communicated with a water inlet of the water ring vacuum pump through a water inlet pipe of the water ring vacuum pump; and the gas outlet of the steam-water separator is communicated with the exhaust pipe through a third pipeline. Through adopting vacuum deoxidization to replace heating power deoxidization, can effectual guarantee deoxidization effect to soft water temperature after the vacuum deoxidization is lower, can not cause boiler feed water vaporization completely, increases boiler feed water pump's life, the steady state operation of guarantee boiler feed water pump.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a boiler feed water vacuum oxygen removal system according to an embodiment.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "secured to," "mounted to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element; when an element is "connected" to another element, or is referred to as being "connected" to another element, it can be directly connected or indirectly connected to the other element.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
The utility model provides a vacuum deoxidizing system for boiler feed water, which comprises a deaerator, a water ring vacuum pump and a steam-water separator; a softened water inlet at the top of the deaerator is communicated with a softened water system through a water inlet pipeline, an exhaust pipe is installed at an exhaust port at the top of the deaerator, and a first outlet at the bottom of the deaerator is communicated with a boiler feed pump through a pipeline; an air suction port of the water ring vacuum pump is communicated with an air outlet at the top of the deaerator through a first pipeline, an air exhaust port of the water ring vacuum pump is communicated with an air inlet of the steam-water separator through a second pipeline, and an water inlet pipeline is communicated with a water inlet of the water ring vacuum pump through a water inlet pipe of the water ring vacuum pump; and the gas outlet of the steam-water separator is communicated with the exhaust pipe through a third pipeline. The vacuum boiler feed water deoxidizing system can effectively guarantee the deoxidizing effect and can better avoid the damage of a water pump.
Please refer to fig. 1. The embodiment provides a boiler feed water vacuum deoxygenation system 100, which comprises a deoxygenator 10, a water ring vacuum pump 20 and a steam-water separator 30. The demineralized water inlet 12 at the top of the deaerator 10 is connected to a demineralized water system via a water inlet line 50, so that demineralized water can be delivered to the deaerator 10 via the demineralized water system. An exhaust pipe 60 is installed at an exhaust port 13 at the top of the deaerator 10, and a first outlet 14 at the bottom of the deaerator 10 is communicated with a boiler feed pump through a pipeline. The suction port 21 of the water ring vacuum pump 20 is communicated with the air outlet 15 at the top of the deaerator 10 through a first pipeline 70, the exhaust port 22 of the water ring vacuum pump 20 is communicated with the air inlet 31 of the steam-water separator 30 through a second pipeline 80, and the water inlet pipeline 50 is communicated with the water inlet 23 of the water ring vacuum pump 20 through a water inlet pipe 90 of the water ring vacuum pump. The air outlet 32 of the steam-water separator 30 is communicated with the exhaust pipe 60 through a third pipeline 110.
The working principle of vacuum deoxygenation is to apply Henry's law and Dalton's law, and according to Henry's law, in a closed container, when the pressure above the water surface is less than atmospheric pressure, the solubility of oxygen can reach zero at lower water temperature. Thus, oxygen molecules on the upper part of the water surface are discharged or converted into other gases, so that the partial pressure of oxygen is zero, and oxygen in the water continuously escapes to achieve the effect of removing oxygen. The deoxygenation method is generally carried out at the temperature of 30-70 ℃, and the steam boilers with large load fluctuation and poor thermal deoxygenation effect can be deoxygenated by vacuum to obtain satisfactory deoxygenation effect.
It can be understood that, in the prior art, the mode of thermal deoxidization is adopted, and for northwest areas of China, a plurality of problems still exist in practical application, firstly, when the temperature of deoxidization water is less than 104 ℃, the deoxidization effect is not good, and when the temperature of deoxidization water is more than 104 ℃, the vaporization of boiler feed water is easily caused, and the dry grinding damage of a boiler feed water pump is caused. According to the statistics of our factory: in 2020, boiler feed water vaporization causes the damage of a boiler feed water pump for up to 4 times, and the direct loss is up to 16 ten thousand yuan. And secondly, the self-consumption steam quantity of the boiler room is increased by thermal deoxygenation, the effective external steam supply is reduced, wherein 1200.204 tons of steam are consumed by the deoxygenator in our factory in 2020, and the energy consumption of our factory is increased. Thirdly, the temperature of the deaerated water entering the boiler economizer is 95-100 ℃, the deaerated water reaches the boiling point temperature of the water under the local standard atmospheric pressure, and the utilization rate of the thermal efficiency of the economizer is less than 10% as can be seen from the exhaust gas temperature (143-.
If a chemical oxygen removal mode is adopted, the safety risk is high, the pollution discharge amount is increased, and the oxygen removal effect is not easy to control; however, when the oxygen removal is performed analytically, although the oxygen removal effect is good, other gases in the water, such as carbon dioxide, cannot be removed, and when the water tank cannot be sealed, the water after oxygen removal contacts with air, thereby affecting the oxygen removal effect.
In the embodiment, vacuum deoxygenation can be performed in a low-temperature state, compared with other two deoxygenation methods, the heating and safety conditions are improved, and the use of boiler self-consumption steam is reduced. Vacuum deoxygenation is a medium-temperature deoxygenation technique, and is generally carried out at a temperature of 30-70 ℃. Can realize the deoxidization (at 70 ℃ or normal temperature) under the low temperature state of the water surface, and can adopt vacuum deoxidization to obtain satisfactory deoxidization effect for thermal boilers and steam boilers with large load fluctuation and poor thermal deoxidization effect. Compared with the thermal deoxidization technology, the heating condition of the device is improved to some extent, the steam consumption of a boiler room is reduced, the vacuum deoxidization can utilize low-grade waste heat, a jet heater can be used for heating softened water, classification and low-position installation can be realized, the deoxidization is reliable, the operation is stable, the operation is simple, and the application range is wide. Since the energy-saving work in China is vigorously carried out, the method for deoxidizing the industrial boiler rooms is increased day by day.
The boiler feed water vacuum deoxidization system 100 that this embodiment provided passes through water ring vacuum pump 20, can be good will the oxygen at oxygen-eliminating device 10 top is discharged, thereby makes the aquatic oxygen in the oxygen-eliminating device 10 constantly escapes, simultaneously through steam-water separator 30 also can be good separates soda, then passes through blast pipe 60 is discharged gas, and realization that can be good is right the water in the oxygen-eliminating device 10 carries out the deoxidization. And can also reduce the energy consumption well, save the cost.
It can be understood that the original thermal deaerator has the design vacuum pressure of 0.102Mpa, the vacuum degree of vacuum deaerator is required to be 0.003Mpa, the vacuum deaerator is lower than the design pressure of the original deaerator, the original deaerator is a normal-pressure container, and the upper part of the tank body is provided with a reserved opening, so that the original deaerator tank body can be completely upgraded and transformed, and the cost can be further reduced.
Preferably, a shut-off valve 120 is disposed on each of the first pipeline 70, the second pipeline 80, and the third pipeline 110. Thereby allowing better control of the boiler feed water vacuum oxygen removal system 100.
Preferably, a check valve is further disposed on the first pipeline 70. Thereby better ensuring the safety of the boiler feed water vacuum oxygen removal system 100.
Preferably, the bottom of the water ring vacuum pump 20 is provided with a damping seat, and a silencing partition is further arranged between the damping seat and the water ring vacuum pump. Therefore, the working environment of a workshop can be better guaranteed.
Preferably, the steam-water separator 30 is a baffle-type steam-water separator. Thereby better guaranteeing the separation effect.
Preferably, the boiler feed water vacuum oxygen removal system 100 further comprises a PLC controller, a first temperature sensor 16 is further arranged in the oxygen remover 10, the first temperature sensor 16 is connected with an input end of the PLC controller, an output end of the PLC controller is connected with the water ring vacuum pump 20, and the PLC controller is used for controlling the operation of the water ring vacuum pump 20 according to a detection signal of the first temperature sensor 16. Therefore, the internal environment in the deaerator 10 is detected in real time through the first temperature sensor 16, so that the operation efficiency of the water ring vacuum pump 20 is controlled, and the deaerating effect is better guaranteed.
The embodiment provides boiler feedwater vacuum deoxidization system 100 can be on former thermal power deoxidization PLC, increase vacuum system's control logic, dissolve oxygen content under the different temperatures and exhale at the vacuum of 0.05mg/L (table 1 is different temperatures, the aquatic oxygen content parameter of vacuum), thereby calculate the vacuum that different temperatures correspond through the PLC controller and adjust the operating frequency of vacuum pump according to temperature variation, guarantee that the vacuum of oxygen-eliminating device satisfies current temperature condition in order to realize that the play water oxygen content reaches boiler standard of intaking (the standard is less than or equal to 0.1 mg/L).
TABLE 1
Preferably, the heating steam inlet 11 at the top of the deaerator 10 is communicated with a heating steam system through a steam pipeline 40, so that the heating steam can be conveyed to the deaerator 10 through the heating steam system, and a first steam electric valve 41 is arranged on the steam pipeline 40. Preferably, the exhaust pipe 60 is provided with an exhaust electric valve 61. The steam pipeline 40 is communicated with the water inlet pipeline 50 through a heat exchange pipeline 130, and a heat exchanger 140 is arranged on the heat exchange pipeline 130. Preferably, a second temperature sensor 150 is further disposed in the water inlet pipeline 50, a second steam electric valve 160 is further disposed in the heat exchange pipeline 130, the second temperature sensor 150 is connected with an input end of the PLC controller, the second steam electric valve 160 is connected with an output end of the PLC controller, and the PLC controller is further configured to control the second steam electric valve 160 to operate according to a detection signal of the second temperature sensor 150. So that the temperature of the softened water entering the deaerator 10 can be controlled by the second temperature sensor 150. When the water temperature of the water tank is lower than 60 ℃, heating by using the waste heat recovery of condensed water; when no condensed water is produced during heating, steam is used for heating. And in this embodiment the boiler feed water vacuum oxygen removal system 100 also has two modes of operation. In the oxygen removal mode by the water ring vacuum pump, the first steam electric valve 41 and the exhaust electric valve 61 may be closed. When the thermal deaerator is used for operation, the water inlet valve of the water ring vacuum pump 20 and the air inlet electric valve of the heat exchanger 140 can be closed, the first steam electric valve 41 and the exhaust electric valve 61 are opened, and two deaerating control systems can be freely switched for use. Preferably, each electric valve in the boiler feed water vacuum oxygen removal system 100 can be connected to the PLC controller, and is controlled by the PLC controller.
Preferably, the water inlet pipe 90 of the water ring vacuum pump is provided with an electromagnetic valve 170, a ball valve 180 and a filter 190. Thereby can be better right water ring vacuum pump inlet tube 90 controls to and filter supplying water, better guarantee water ring vacuum pump 20's result of use and life.
Preferably, the water ring vacuum pump 20 adopts a 2BV5111-5.5KW vacuum pump, so that the water ring vacuum pump 20 has the advantages of compact structure, high efficiency, low price, high vacuum degree and stable performance.
Preferably, a vacuum degree sensor is further arranged in the deaerator 10 and connected with the input end of the PLC, so that the vacuum degree in the deaerator 10 can be better detected. It can be understood that the boiler feed pump on the outlet pipeline of bubbling type deaerating tank bottom can cause certain pressure release to the vacuum degree in the tank when supplying water to the boiler, and according to installing on deaerator 10 the value of vacuum degree sensor and boiler feed pump intermittent motion mode can be better write vacuum degree value compensation procedure.
The existing PLC of the boiler feed water vacuum deoxygenation system 100 provided by the embodiment reserves DI/DO points and is additionally provided with AI/AO modules, and remote control, a vacuum degree sensor, frequency feedback setting of a frequency converter, an electric valve, a temperature sensor and other control signals are accessed into the modules, so that the remote control function is realized, complete re-purchase or manufacture is not needed, and the cost can be effectively reduced.
The boiler feed water vacuum deoxygenation system 100 provided by the embodiment can increase the control logic of the vacuum pumping pump in the original bubbling thermal deoxygenator, exhaust the vacuum degree of the dissolved oxygen content of 0.05mg/L at different temperatures, calculate the vacuum degree corresponding to different temperatures through PLC, adjust the PID (proportion integration differentiation) adjustment of the working frequency of the water ring vacuum pump 20 according to the temperature change, effectively control the optimal parameter setting during deoxygenation of the water ring vacuum pump 20, effectively ensure the boiler feed water quality, and achieve the oxygen content of the deoxygenated water less than or equal to 0.050 (mg/L).
And the temperature of the soft water after vacuum deoxygenation is low, so that the vaporization of boiler feed water is completely avoided, the service life of a boiler feed pump is prolonged, and the stable operation of the boiler feed pump is ensured.
When the deoxidized water with the temperature of 30-70 ℃ enters the energy saver, the afterheat of the boiler flue gas can be effectively utilized, according to Q ═ A x K (Tr-Deltat), when the heat exchange area, the exhaust gas temperature and the heat exchange coefficient are fixed, the heat exchange efficiency is related to the average temperature of water, when the inlet water temperature is 100 ℃, the outlet water temperature is 120 ℃, the average temperature is 110 ℃, when the inlet water temperature is 70 ℃, the outlet water temperature is 110 ℃, the average temperature is 100 ℃, therefore (Tr-110 ℃) is less than (Tr-100 ℃), Q1 is less than Q2, and finally the obtained low-temperature water can obtain more heat through the energy saver, and the utilization efficiency of the energy saver is highest.
The thermal deoxygenation requires that the water temperature is 104 ℃, the vacuum deoxygenation water temperature is 30-70 ℃, and the service life of the deoxygenator can be effectively prolonged under the condition of low temperature.
The baffle type steam-water separator is selected to better reduce the kinetic energy of water drops, most of the kinetic energy is condensed and then falls to the bottom of the separator, and the condensed water is discharged into the vacuum pump circulating water tank through the drain valve to form recycling.
The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.
Claims (10)
1. A vacuum deoxidation system for boiler feed water is characterized by comprising a deaerator, a water ring vacuum pump and a steam-water separator;
a softened water inlet at the top of the deaerator is communicated with a softened water system through a water inlet pipeline, an exhaust pipe is installed at an exhaust port at the top of the deaerator, and a first outlet at the bottom of the deaerator is communicated with a boiler feed pump through a pipeline;
an air suction port of the water ring vacuum pump is communicated with an air outlet at the top of the deaerator through a first pipeline, an air exhaust port of the water ring vacuum pump is communicated with an air inlet of the steam-water separator through a second pipeline, and an water inlet pipeline is communicated with a water inlet of the water ring vacuum pump through a water inlet pipe of the water ring vacuum pump;
and the gas outlet of the steam-water separator is communicated with the exhaust pipe through a third pipeline.
2. The boiler feed water vacuum oxygen removal system of claim 1, wherein stop valves are disposed on the first pipeline, the second pipeline and the third pipeline.
3. The boiler feed water vacuum oxygen removal system of claim 2, wherein a check valve is further disposed on said first conduit.
4. The boiler feed water vacuum oxygen removal system according to claim 1, wherein a shock absorption seat is arranged at the bottom of the water ring vacuum pump, and a silencing partition is arranged between the shock absorption seat and the water ring vacuum pump.
5. The boiler feed water vacuum oxygen removal system of claim 1, wherein said steam-water separator is a baffled steam-water separator.
6. The boiler feed water vacuum oxygen removal system of claim 1, further comprising a PLC controller, wherein a first temperature sensor is further arranged in the oxygen remover, the first temperature sensor is connected with an input end of the PLC controller, an output end of the PLC controller is connected with the water ring vacuum pump, and the PLC controller is used for controlling the operation of the water ring vacuum pump according to a detection signal of the first temperature sensor.
7. The boiler feed water vacuum oxygen removal system of claim 6, wherein a vacuum degree sensor is further arranged in the oxygen remover, and the vacuum degree sensor is connected with the input end of the PLC controller.
8. The vacuum deaerating system for boiler feed water of claim 6, characterized in that the heating steam inlet at the top of the deaerator is communicated with the heating steam system through a steam pipeline, and the steam pipeline is provided with a first steam electric valve, the steam pipeline is further communicated with the water inlet pipeline through a heat exchange pipeline, and the heat exchange pipeline is provided with a heat exchanger.
9. The boiler feed water vacuum deoxygenation system of claim 8, wherein a second temperature sensor is further disposed in the water inlet pipeline, a second steam electric valve is further disposed in the heat exchange pipeline, the second temperature sensor is connected with an input end of the PLC, the second steam electric valve is connected with an output end of the PLC, and the PLC is further configured to control the second steam electric valve to operate according to a detection signal of the second temperature sensor.
10. The boiler feed water vacuum oxygen removal system of claim 1, wherein the water ring vacuum pump inlet pipe is provided with an electromagnetic valve, a ball valve and a filter.
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| CN202220912183.4U CN217131244U (en) | 2022-04-14 | 2022-04-14 | Vacuum deoxidization system for boiler water supply |
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| CN202220912183.4U CN217131244U (en) | 2022-04-14 | 2022-04-14 | Vacuum deoxidization system for boiler water supply |
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